Roof Truss Lateral Support

Continuous lateral brace clr.

Roof truss lateral support.

At both gable ends and at least every 20 add wind bracing green for truss clusters. Continuous lateral bracing or restraint is very important. At places of heavy rainfall or heavy snowfall sloping roofs are necessary which have to be supported by roof trusses. Extra support for the trusses can be made by placing a 2 by 4 inch piece of lumber from each truss on one side to the truss on the other side high enough to provide head room but low enough to provide support for the trusses.

Permanent bracing listed on the truss design drawing for specific web members and permanent bracing for the roof or floor system. The clr must be properly braced to prevent the simultaneous lateral deformation and or buckling of the series of truss members to which it is attached due to laterally imposed loads on and or the accumulation of buckling forces within the. Certain truss members require bracing in order to carry the full design load. The images below show these critical components and their recommended placement.

Part of a truss that extends beyond its support exclusive of overhang. When truss spacing exceeds 2 feet purlins are generally required to support roof sheathing. Also need sloping roofs and hence roof trusses. The number of trusses clustered depends on building span and truss spacing.

This condition generally applies when trusses are spaced at 2 feet. Workshops warehouses industrial buildings etc. In this situation the walls of a finished attic space or room would go with the roof line. There are two separate types of bracing to be concerned about.

Roof sheathing plywood osb provides effective lateral bracing when sheathing is nailed directly to top chords.